Bug 206850 [Regression] Error pops up when select value for a map or highlight rule to group header row [0302]
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/elements/structures/StyleRule.java
* 
	 * @return the expression
	 */
	public String getTestExpression( )
	{
		return testExpression;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.Structure#isDesignTime()
	 */
	public boolean isDesignTime( )
	{
		Boolean isDesignTime = (Boolean) getProperty( null,
				IS_DESIGN_TIME_MEMBER );
		if ( isDesignTime == null )
			return true;
		return isDesignTime.booleanValue( );
	}
	/**
	 * Sets the design time status for this structure.
	 * 
	 * @param isDesignTime
	 */
	public void setDesignTime( boolean isDesignTime )
	{
		setProperty( IS_DESIGN_TIME_MEMBER, Boolean.valueOf( isDesignTime ) );
	}
}