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Overlap Components When Using ComponentResizer

I want to make my jTable expandable while floating/overlay when dragging it using ComponentResizer class. I'm using ComponentResizer class from Rob Camick.
Currently as below after dragging the table:
I tried change my layout to null but the result still same.
In my code, I just added to call the ComponentResizer class:
ComponentResizer cr = new ComponentResizer();
cr.setSnapSize(new Dimension(10, 10));
cr.registerComponent(jScrollPane2);
I expect the dragging table will float and overlay the components below it.

Swing is designed to paint components in 2D space, not 3D space.
So when components are added to the same panel, Swing will paint components in the reverse order the component is added to the panel. In your case it looks like you add the components to the panel before adding the scrollpane to the panel.
So you could:
reverse the order in which you add the components to the panel
use the setComponentZOrder(...) method on the scrollpane to set its value to 0, so it is painted last.
However, this will still cause a problem because if you hover over the button the button will appear because its border is changed. This is because Swing assumes 2D layouts not 3D. If you want to make sure the table is always painted over the button you need to override the isOptimizedDrawingEnable() method of the panel. See Overlap Layout for more information on ZOrder painting.

I solved the problem by put all components in one layered pane and using Border Layout.

Add components dynamically in JavaFX

Updated: question is incorrect because of low knowledge of the subject. Sorry.
I'm trying to create a small application that shows a graph that contains nodes and connections between them. Both nodes and connections are complex, I mean they can have another components in it, like labels.
I have a big Pane which plays a canvas role. I'm going to add and remove elements from it. The problem is that I want to add or remove graph elements dynamically, using buttons or context menu. Sort of Paint for Graphs :) And I have no idea how to implement it.
Especially I desperately need help in dynamical adding/removing mechanism. I would be very grateful for your help!

Just get the child list of the pane you want to add stuff to, and add the stuff when the appropriate action occurs.
FlowPane pane = new FlowPane();
Button addNode = new Button("Add");
addNode.setOnAction(e -> pane.getChildren().add(new Circle(10));
Notes:
If you want to use a Pane rather than a FlowPane, then Pane has no internal layout, so you need to also set the layoutX and layoutY properties appropriately when you add to the Pane.
If you want to change the rendering order of nodes in the Pane (e.g. which nodes are rendered on the bottom and which on top), then you do that by adding new nodes at an appropriate position in the child list; for example, pane.getChildren().add(0, new Circle(10)), will add a circle that is rendered underneath all other children of the pane rather than on top.

Using an image instead of JDialog/frame to hold swing components?

I currently have a JDialog (class that implements JDialog and is constructed like a jframe), and has 3 swing buttons placed on it. Currently I have it set, undecorated = true, to hide the outer frame. Is there any way to use my image to replace the default square frame?
This is what I aim for :
The blue square with shadow is the pre made image.
Regards

The blue square with shadow is the pre made image.
Well, the best way would be to set the background of the panel and then add a ShadowBorder to the panel. This will provide you with far more flexibility in the future as you can create many panels with different colors and reuse the same ShadowBorder instead of having to create an Image every time. I don't have an example of a ShadowBorder, but you might find one if you search the web.
Is there any way to use my image to replace the default square frame?
But if you really want to use your premade Image, then you can just:
create a JLabel and add your Image to the label as an Icon
add the label to the dialog
set the layout manager of the label
add your components to the label.

JavaFX layout that scales with parent

I'm using JavaFX in a project instead of Swing because of the enhanced multimedia, webviewer and possibility to use visual effects. However, what I've learned from what I found on the web (http://docs.oracle.com/javafx/2/layout/jfxpub-layout.htm and others) is that JavaFX layout managers focus on scaling the size of the parent based on the size of the content, whereas Swing focusses on scaling the content according to the parent, at least based on the Layout being used.
Right now I'm using an Accordion with some TitledPane children. One of them contains a GridPane for the simple reason it is the best way I know to emulate a GridLayout (as I learned from my previous question here: JavaFX layout equivalent to GridLayout). I want to have the TitledPane's content split in 2 rows and 1 column, each row with a 50% height of the available space in the TitledPane (scaling with the Stage or Scene), equivalent to what a GridLayout(2,1) inside a BorderLayout.CENTER would accomplish. For this, I've added a GridPane with 2 RowConstraints using setPercentHeight(50) and 1 ColumnConstraint with setPercentWidth(100). However, I've noticed the contents are scaling with the grid properly, but the grid is not taking up all available space in the TitledPane (because apparently it doesn't act like a BorderPane's center). I've also tried with setMaxWidth to make the content scale with the parent, but it doesn't seem to work either (as said here: JavaFX: How to make my custom component use all available space from parent layout?). And even if it would, do I need to set the max width to EACH descendent in my UI elements tree to have all of them scale?
Either way, does anyone know how to make a TitledPane with 2 equal spaces in it underneath eachother that scale with the titledpane's size?

In fact, your gridpane is growing to fill all its parent.
Consider the below code, I have added a background color (red) to the gridpane for debugging purposes.
Accordion accordion = new Accordion();
TitledPane titledPane = new TitledPane();
titledPane.setText("Title");
GridPane gridPane = new GridPane();
gridPane.setStyle("-fx-background-color:red");
gridPane.add(new TextArea("Hello"), 0, 0);
gridPane.add(new TextArea("World"), 0, 1);
titledPane.setContent(gridPane);
accordion.getPanes().add(titledPane);
If you execute this code, the gridpane will fill all its parent (check the red color spans all over the titledpane content).
However, the content of the gridpane will not fill all the column. If you try to resize the window, you will see that the textareas are not changing in width along with the gridpane.
To fix that, you need to tell the first column of the gridpane to grow with the gridpane itself.
The way to do that is to add the following constraint:
ColumnConstraints columnConstraints = new ColumnConstraints();
columnConstraints.setFillWidth(true);
columnConstraints.setHgrow(Priority.ALWAYS);
gridPane.getColumnConstraints().add(columnConstraints);

problem with textarea in javafx?

I used textarea in javafx 2.0 but i need to add it scrolpane.how can i do that?
Scrolllpane s = new Scrollpane();
s.setnode(textarea);
but when i click on scroll pnane it has doesn't move.
what is problem?

setNode() is the right method to call to set the node that the ScrollPane will scroll over. I've used ScrollPane extensively in my 2.0 app, but I have not tried it on Text Area. Based on the API documentation for TextArea (http://download.oracle.com/javafx/2.0/api/com/javafx/preview/control/TextArea.html) it sounds like it has its own built in scroll bars? I would try setting the width/height of the TextArea, and also set the max width/height, and see if you can trigger scrollbars to appear automatically when the lines in the text area exceed the available space.
If you still want to put it in a ScrollPane, perhaps with some other nodes, you should use a container node such as VBox or something to wrap the TextArea, then set the VBox to be your scroll node on ScrollPane.
Also, bear in mind that TextArea is not a committed control for FX 2.0 yet and is therefore less hardened than the other FX controls.

When we create a text area, scroll bar automatically appears when it goes beyond t