Bug 122283 [Smoke][Regression][SPM-Linux WS]Item in library can't be used when include library from library explorer
Details: Item in library can't be used when include library from library explorer Step: 1.New a library and Insert a label. 2.Open a report design 3.Open the library exploer in report and use the library 4.Drop the library label from library explorer into layout Actual results: Expection pop up. If use the library from report outline, label can drop in layout succeed.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
* Returns the width hint for the given control.
	 * 
	 * @param wHint
	 *            the width hint
	 * @param c
	 *            the control
	 * 
	 * @return the width hint
	 */
	public static int getWidthHint( int wHint, Control c )
	{
		boolean wrap = isWrapControl( c );
		return wrap ? wHint : SWT.DEFAULT;
	}
	/**
	 * Returns the height hint for the given control.
	 * 
	 * @param hHint
	 *            the width hint
	 * @param c
	 *            the control
	 * 
	 * @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 )