c# - WPF drag distance threshold -

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i have program 2 wpf treeviews allow dragging , dropping between two. problem is, can annoying open / close items on treeviews because moving mouse 1 pixel while holding left mouse button triggers drag / drop functionality. there way specify how far mouse should move before it's considered drag / drop?

there's system parameter this. if have

point down = {where mouse down event happened} point current = {position in mousemove eventargs}

then mouse has moved minimum drag distance if

math.abs(current.x - down.x) >= systemparameters.minimumhorizontaldragdistance || math.abs(current.y - down.y) >= systemparameters.minimumverticaldragdistance)

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