Built-in Mathematica Symbol

PopupView

PopupView[{expr₁, expr₂, ...}]
represents an object which displays as a popup menu whose items are the expr_i.

PopupView[{expr₁, expr₂, ...}, i]
makes the i

entry be the one currently chosen.

PopupView[{expr₁, expr₂, ...}, i, base]
displays as base if it is not being clicked.

PopupView[list, Dynamic[i]] takes the item chosen to be specified by the dynamically updated current value of i, with the value of i being reset if a different item is chosen.

BaselinePosition	Baseline	alignment relative to surrounding text
BaseStyle	{}	base style specifications for the displayed menu
Enabled	Automatic	whether the menu is enabled, or grayed out
FieldSize	{{1.,50.},{1.,10.}}	the size of the field for menu items
FrameMargins	Automatic	margins inside the menu frame
ImageMargins	0	margins around the displayed menu
ImageSize	All	the overall image size of the displayed menu

With the default option setting ImageSize->All, PopupView always leaves space for the largest of the expr_i to be displayed, so that its overall size does not change.

With ImageSize->Automatic, PopupView leaves space only for the expr_i currently being displayed.

Item can be used to give style specifications that apply throughout a menu item.

PopupView by default displays the lbl_i in "PopupView" style, which typically uses the system menu font.

With the default setting BaselinePosition->Baseline, the baseline of the PopupView is taken to be the baseline of the currently displayed item.

The settings for BaseStyle are appended to the default style typically given by the "PopupView" style in the current stylesheet.