Bug 153523 OK button in parameter dialog is enabled without default value in combo-box
Description: OK button in parameter dialog is enabled without default value in combo-box Steps to reproduce: 1. New a report parameter, combo-box. 2. Click New button, input abc as value, click OK 3. Set abc as default value and close Edit Parameter dialog. 4. New a data source and dataset 5. Edit the parameter, remove abc value and import values from dataset Expected result: OK button is disabled for there is no default value. Actual result: OK button is enabled.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
private void setLabelLayoutData( Label label )
	{
		GridData gd = new GridData( );
		if ( label.getText( ).equals( LABEL_VALUES ) )
		{
			gd.verticalAlignment = GridData.BEGINNING;
		}
		label.setLayoutData( gd );
	}
	private void addCheckBoxListener( final Button checkBox, final String key )
	{
		checkBox.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				checkBoxChange( checkBox, key );
			}
		} );
	}
	/**
	 * @param key
	 * @param checkBox
	 * 
	 */
	protected void checkBoxChange( Button checkBox, String key )
	{
		dirtyProperties.put( key, new Boolean( checkBox.getSelection( ) ) );
		if ( CHECKBOX_ALLOW_BLANK.equals( key )
				|| CHECKBOX_ALLOW_NULL.equals( key ) )
		{
			if ( isStatic( ) )