ListBox not showing items in DraggableWidget

[Nghia Nguyen]

Hi All, I'm sorry for my English is very bad.I hope everybody understand that i want say.I have problem about drag and drop.I using library:

<groupId>com.googlecode.gwtquery</groupId>

<artifactId>gwtquery</artifactId>

<version>1.2.0</version>

</dependency>

<dependency>

<groupId>com.googlecode.gwtquery.plugins</groupId>

<artifactId>draggable-plugin</artifactId>

<version>1.0.4</version>

<scope>provided</scope>

</dependency>

<dependency>

<groupId>com.googlecode.gwtquery.plugins</groupId>

<artifactId>draggable</artifactId>

<version>1.0.4</version>

<type>pom</type>

<scope>provided</scope>

</dependency>

<dependency>

<groupId>com.googlecode.gwtquery.plugins</groupId>

<artifactId>droppable-plugin</artifactId>

<version>1.0.6</version>

<scope>provided</scope>

</dependency>

When i add a ListBox in DraggableWidget and click it, it not showing items.I searched GG but can not help me.Please help me.Thanks for read.