If you need access to selected drawings in list of Tekla Drawings – next piece of code will be useful

 

{

var CurrentDrawingHandler = new TSD.DrawingHandler(); //Get handler - seems easy.

var drawingsEnum = CurrentDrawingHandler.GetDrawingSelector().GetSelected(); //Get a list of selected drawings

while(drawingsEnum.MoveNext()) //goest through that list
{
var _drawing = drawingsEnum.Current as TSD.Drawing;  //here is a particular drawing which we coudl work width
string some_string = string.Empty;
_drawing .GetUserProperty("Default", ref some_string );//let's do sometring, get some UDA for example.

MessageBox.Show(some_string ); //And show it
}
}