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WPF - Why the content of Scrollview flickers during scrolling if the UIControl set ManipulationEnabled = true?

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There is a stackpanel in scrollview , and then ten buttons are added in the stackpanel.

The panning mode of scrollview is vertically.

Because i need to detect touch up event on button , so i set the ManipulationEnabled property value of button to be true.

Therefore, i can scroll the scrollview and detect the touch up event on button together.

But i found a following strange thing when i scroll up and down quickly , the content of scrollview flickers :

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