protected void buildBackground(double verticalExtent = GlobalStatusSingleton.PATTERN_FULL_COVERAGE)
{
if (backgroundImg == null)
{
int w = (int)Width;
int h = (int)Height;
// don't switch w or h here. we are building the correct image for the current w,h setting.
backgroundImg = GlobalSingletonHelpers.buildBackground(backgroundPatternFilename, this.GetType().GetTypeInfo().Assembly, w, h, verticalExtent);
}
}