For Custom Numbered Heading Styles "Redo" is not working.

Question

I am using word VSTO addins.

 

I created the Custom Numbered Heading Styles in word. After applying the Heading style to 1st paragraph, If I use Redo(CTR+Y) to next paragraph it is not working.

 

Here is my code.

 

public void NumHeading1(Office.IRibbonControl control)

{

try

{

Microsoft.Office.Interop.Word.Application app = Globals.ThisAddIn.Application;

Microsoft.Office.Interop.Word.Document doc1 = app.ActiveDocument;

Selection wordSelection = Globals.ThisAddIn.Application.Selection;

wordSelection.Paragraphs.set_Style(WdBuiltinStyle.wdStyleHeading1);

}

catch (Exception ex)

{

throw;

}

}

 

Please anyone can help me in this.