Fixed problem with receiving a top level document for the class CBlockLevelSdt.

word/Editor/StructuredDocumentTags/BlockLevel.js

@@ -701,6 +701,10 @@ CBlockLevelSdt.prototype.CheckRange = function(X0, Y0, X1, Y1, _Y0, _Y1, X_lf, X
 		return this.Content.CheckRange(X0, Y0, X1, Y1, _Y0, _Y1, X_lf, X_rf, CurPage, Inner, bMathWrap);
 	}
 };
+CBlockLevelSdt.prototype.Get_TopDocumentContent = function()
+{
+	return this.Parent.Get_TopDocumentContent();
+};
 //--------------------------------------------------------export--------------------------------------------------------
 window['AscCommonWord'] = window['AscCommonWord'] || {};
 window['AscCommonWord'].CBlockLevelSdt = CBlockLevelSdt;