Bug 141959 Changing data set didn't clean old column bindings
Steps to reproduce: 1.Add two data sets, "ds1" and "ds2" 2.Add a table, binding with "ds1". All "ds1" column bindings generate automatically, that's good 3.Change "ds1" to None Expected result: All "ds1" column bindings should be cleaned Actual result: All "ds1" column bindings are still there. If changing to "ds2", "ds2" column bindings will be added after them.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ColumnBindingDialog.java
}
			else
			{
				item.getForeground( 1 ).equals( Display.getDefault( )
						.getSystemColor( SWT.COLOR_BLUE ) );
				item.setForeground( 1, Display.getDefault( )
						.getSystemColor( SWT.COLOR_LIST_FOREGROUND ) );
			}
		}
	}
	protected boolean initDialog( )
	{
		if ( canSelect )
		{
			if ( inputElement instanceof DataItemHandle )
			{
				selectedColumnName = ( (DataItemHandle) inputElement ).getResultSetColumn( );
				updateSelection( );
			}
		}
		/*
		 * generateButton.setEnabled( inputElement.getDataSet( ) != null ||
		 * DEUtil.getBindingHolder( inputElement ).getDataSet( ) != null );
		 */
		updateButtons( );
		return super.initDialog( );
	}
	protected void okPressed( )
	{
		if ( canSelect )