Add standard command button “New Slide” to custom ribbon in office add-in

Question

I have created my customized ribbon in an addIn. Now I would like to add the New Slide command that exist in home screen (see screenshot below)

Answer 1

i currently have new slide button in my addin like the image below which gives me a new slide

however I want the option like the already existing new slide in home ribbon where I can choose templates.Is there any way to invoke this button in my customized ribbon so below is my newslide that is what i want to get in my addin

  private void New_slide_Click(object sender, RibbonControlEventArgs e)
    {

        PowerPoint.Application ppApp = Globals.ThisAddIn.Application;
        ppApp.CommandBars.ExecuteMso("SlideNewGallery");
    }