Bug 162181 [Smoke] Can't drag datasource and data set from library to the report
The test build is on eclipse 3.2.1 Step to reproduce: 1. new a library and create datasource and dataset in it 2. new a report 3. drag the datasource and dataset to the outline view or data explorer Actual result: It take no effect. Excepted result: It can work.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dnd/DesignElementDropAdapter.java
* @param target
	 *            target elements
	 * @param transfer
	 *            transfer data
	 * @return if target elements can be dropped
	 */
	protected abstract boolean validateTarget( Object target, Object transfer );
	/**
	 * Moves elements
	 * 
	 * @param transfer
	 *            transfer elements.
	 * @param target
	 *            target elements
	 * @return if succeeding in moving data
	 */
	protected abstract boolean moveData( Object transfer, Object target );
	protected abstract boolean ApplyTheme( ThemeHandle themeHandle,
			ModuleHandle moudelHandle );
	/**
	 * Copys elements
	 * 
	 * @param transfer
	 *            transfer elements.
	 * @param target
	 *            target elements
	 * @return if succeeding in copying data
	 */
	protected abstract boolean copyData( Object transfer, Object target );
}