UMG Combobox options event

Hi,

I am new to game development and Unreal Engine 4. I am using version 4.6.1

I have added 3 elements in Combobox namely Material 1, Material 2 and Material 3. If I click any options, the material should change accordingly.

Can somebody please help me to find the solution for this issue.

Is there any tutorial or blueprints for changing Combobox options?

Thanks in advance!