Bug 191685 [regression]Set default value doesn't work in Report Parameter[0705]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
private void updateButtons( )
	{
		boolean canFinish = !StringUtil.isBlank( nameEditor.getText( ) );
		if ( canFinish )
		{
			if ( errorMessageLine != null && !errorMessageLine.isDisposed( ) )
			{
				canFinish = ( errorMessageLine.getImage( ) == null );
			}
			if ( columnChooser != null && !isStatic( ) )
			{
				canFinish &= ( getExpression( columnChooser.getText( ) ) != null );
			}
		}
		getOkButton( ).setEnabled( canFinish );
	}
	private void updateCheckBoxArea( )
	{
		
		if ( DesignChoiceConstants.PARAM_CONTROL_TEXT_BOX.equals( getSelectedControlType( ) ) )
		{
			doNotEcho.setEnabled( true );
		}
		else
		{
			doNotEcho.setEnabled( false );
		}
	}
	private void updateMessageLine( )
	{