Hello Nihar,

Thank you for posting to our forum.

In order to increase the width of the dropdown arrow in a segmented MenuTool you could just replace the arrow element with an image element and set its width .

There are two way to achieve it:

First in the code behind use Utilities class and get the child element of the ribbon menu using GetDescendantFromType method and add new image child element.

Something like this:

Grid grid = Infragistics.Windows.Utilities.GetDescendantFromName(igRibbonTest, "containerGrid") as Grid ;

grid.Children.Clear();
grid.Children.Add(new Image() { Source = new BitmapImage(new Uri("../../download.png", UriKind.RelativeOrAbsolute)), Height = 20, Width = 20 });

or the another way is, in the Xaml code add the default style of the menu and modify it by adding a triangle image and set its width.

I modified your sample application and attached it back for your reference.

Please let me know if you need further assistance.4747.WpfApplication1.zip