Bug 201042 [Accessibility]Chart scritp should not add by auto when click the down in keyboard[17]
Description: Chart scritp should not add by auto when click the down in keyboard[0704] Step: 1. New a chart and switch to script view. 2. Let the point on the script function selection. 3. Click the down on keyboard. Actual result: A function will add by auto. Expected result: Customer can not select the function under the second function by keyboard, and it should not be added by auto.
chart/org.eclipse.birt.chart.ui.extension/src/org/eclipse/birt/chart/ui/swt/composites/LineAttributesComposite.java
lblColor.setLayoutData( gdLColor );
			lblColor.setText( Messages.getString( "LineAttributesComposite.Lbl.Color" ) ); 
			lblColor.setEnabled( bEnableUI );
			cmbColor = new FillChooserComposite( cmpContent,
					SWT.DROP_DOWN | SWT.READ_ONLY,
					wizardContext,
					this.laCurrent.getColor( ),
					false,
					false );
			GridData gdCBColor = new GridData( GridData.FILL_HORIZONTAL );
			gdCBColor.horizontalSpan = 5;
			cmbColor.setLayoutData( gdCBColor );
			cmbColor.addListener( this );
			cmbColor.setEnabled( bEnableUI );
		}
	}
	public Point getPreferredSize( )
	{
		Point ptSize = new Point( 250, 40 );
		if ( bEnableVisibility )
		{
			ptSize.y += 30;
		}
		if ( bEnableStyles )
		{
			ptSize.y += 30;
		}
		if ( bEnableWidths )
		{
			ptSize.y += 30;