Bug 120216 Group dialog should be showed even dataset is not set.
- Add a table report item - do not set the data set - try creating a new table group. - An error is shown Expected behavior - As part of the template requirements, we dont want UI to do the validation. User should be able to go and define a group, even if the dataset is not defined.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
* @return the height hint
	 */
	public static int getHeightHint( int hHint, Control c )
	{
		if ( c instanceof Composite )
		{
			Layout layout = ( (Composite) c ).getLayout( );
			if ( layout instanceof ColumnLayout )
				return hHint;
		}
		return SWT.DEFAULT;
	}
	/**
	 * Updates the page scroll increment for given composite.
	 * 
	 * @param scomp
	 */
	public static void updatePageIncrement( ScrolledComposite scomp )
	{
		ScrollBar vbar = scomp.getVerticalBar( );
		if ( vbar != null )
		{
			Rectangle clientArea = scomp.getClientArea( );
			int increment = clientArea.height - 5;
			vbar.setPageIncrement( increment );
		}
	}
	private static boolean isWrapControl( Control c )
	{
		if ( c instanceof Composite )