//Note that this function results in syncronous callbacks and will only return when done.
// It will be done when either: All sources have been enumerated, or if the called function returns 0.
// Read elias.h or the manual for more information.
public int EnumerateSources(SourceEnumerationCallback secb) {
IntPtr user_data = new IntPtr();
return elias_theme_enumerate_sources(this.Handle, secb, out user_data);
}