Bug 132652 Click other property will cause the previous revised value lost in Properties sheet.
Description: Click other property will cause the previous revised value lost in Properties sheet. Steps to reproduce: 1. Insert a label 2. Open Properties sheet, select the label. 3. Input 10pt in Margin left, then click Margin right. Expected result: 10pt is saved. Actual result: 10pt was lost.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/swt/custom/CCombo.java
*	when the widget has been disposed
*/
public Point getSelection () {
	checkWidget();
	return text.getSelection ();
}
/**
* Gets the index of the selected item.
* <p>
* Indexing is zero based.
* If no item is selected -1 is returned.
*
* @return the index of the selected item.
*
* @exception SWTError(ERROR_THREAD_INVALID_ACCESS)
*	when called from the wrong thread
* @exception SWTError(ERROR_WIDGET_DISPOSED)
*	when the widget has been disposed
*/
public int getSelectionIndex () {
	checkWidget();
	return list.getSelectionIndex ();
}
public int getStyle () {
	int style = super.getStyle();
	style &= ~SWT.READ_ONLY;
	if (!text.getEditable()) style |= SWT.READ_ONLY; 
	return style;
}
/**