({{, (RefLink[TransitionDirection, paclet:ref/TransitionDirection]) 
is an option for (RefLink[PaneSelector, paclet:ref/PaneSelector]) that specifies the direction in which a transition moves.}})

OpenersNotesSection(Spacer1)Details

Possible settings for (RefLink[TransitionDirection, paclet:ref/TransitionDirection]) are:

OpenersPrimaryExamplesSection(Spacer1)Examples  (1)

OpenersExampleSection0(Spacer1)Basic Examples  (1)

Create a transition that moves from bottom to top:

DynamicModule[{n=False},Row[{Checkbox[Dynamic[n]],PaneSelector[{False->"abc",True->"def"},Dynamic[n],TransitionDirection->Top,TransitionEffect->"Push"]}]]