Bug 136256 Enhance the message builder
Please see the spec attached in 133995 for detail.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ImageBuilder.java
}
	private void swtichToExprType( )
	{
		Label title = new Label( inputArea, SWT.NONE );
		uriEditor = new Text( inputArea, SWT.SINGLE | SWT.BORDER );
		uriEditor.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		uriEditor.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				updateButtons( );
			}
		} );
		Composite innerComp = new Composite( inputArea, SWT.NONE );
		innerComp.setLayoutData( new GridData( GridData.HORIZONTAL_ALIGN_END ) );
		if ( selectedType == BLOB_TYPE )
		{
			innerComp.setLayout( new GridLayout( 3, false ) );
			title.setText( Messages.getString( "ImageBuilder.Label.EnterExpr" ) ); 
		}
		else
		{
			innerComp.setLayout( new GridLayout( 2, false ) );
			title.setText( DLG_ENTER_URI_LABEL );
		}
		Button inputButton = new Button( innerComp, SWT.PUSH );
		inputButton.setText( Messages.getString( "ImageBuilder.Label.Open" ) ); 
		inputButton.setLayoutData( new GridData( GridData.HORIZONTAL_ALIGN_END ) );
		inputButton.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent event )
			{