Bug 175664 [Mac] Unexpected internal exception occurs when invoke expression builder
Description: There are two problems: 1. "fx" button (Click this button to invoke Expression Builder) could not be displayed correctly, nothing displayed in the button. 2. Click on the button, an unexpected internal exception occurs. Version:2.2.0.v20070205 Steps to reproduce: 1.Insert a Data item to the layout. Click "fx" button to invoke the expression builder, although on Mac "fx" button could not display correctly. Error log: Argument cannot be null Plug-in Provider: Eclipse.org Plug-in Name: BIRT Designer UI Plug-in ID: org.eclipse.birt.report.designer.ui Error Code: Error.GUIException.invokedByUnexpectedException Error Message:Argument cannot be null
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
}
				else if ( obj instanceof TableCellEditPart )
				{
					part = (TableEditPart) ( (TableCellEditPart) obj ).getParent( );
				}
				if ( number != -1 )
				{
					int lenegth = selectContents.length;
					int[] temp = new int[lenegth + 1];
					System.arraycopy( selectContents, 0, temp, 0, lenegth );
					temp[lenegth] = number;
					selectContents = temp;
				}
			}
			if ( part == null
					|| selectContents.length == 0
					|| !viewer.getControl( ).isVisible( ) )
			{
				return;
			}
			if ( selectionType == 0 )
			{
				part.selectRow( selectContents, notofyToMedia );
			}
			else if ( selectionType == 1 )
			{
				part.selectColumn( selectContents, notofyToMedia );
			}
		}
		else