How to capture control of wpf window using C# WPF to image

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WPF

C#5.0

Hi All,

I have WPF project with mainwindow which contain 2 tabs(2 canvas).
in 2 each tab I can draw some control hor shape(ractangle, ellipse,...).

My require is when click on button Capture, I will capture all data of each tab(consist control of it) to png image(I will get 2 images corresponding with 2 tabs).

Current I only can caputure one of them corresponding with showed tab on screen.
EX: if tab1 is showed -> I captured tab1,
if tab2 is showed -> I capture tab2.

Please hlp me capture 2 tabs when click on button Capture.

Thanks in advance!