Add ContextMenu to a button which is inside a contextMenu

See more:

WPF

user-controls

DataGrid

I am developing an application using WPF with C#.
I am showing a User Control as a Context Menu.
The User Control displays a list of Buttons from DataGrid,
now what i need is to show a Context Menu for the Button while the previous ContextMenu(i.e. User Control) should be open.
The ContextMenu for buttons is loaded dynamically from code, I tried using the properties

cMenu.IsOpen=true

each time when the button is clicked, to stay the Parent context menu opened. Its working fine, but it shows like a Reloading effect of parent context menu.
Kindly tell me how to avoid that reloading effect or any other ideas to implement my requirement.

Requirement is
1.Show UserControl as ContextMenu
2.Load a DataGrid with buttons in UserControl
3.Show ContextMenu for the buttons without closing the ContextMenu or Reloading the ContextMenu