Tells the delegate that the Save panel is about to expand or collapse because the user clicked the disclosure triangle that displays or hides the file browser.
Original signature is '- (void)panel:(id)sender willExpand:(BOOL)expanding'
Available in Mac OS X v10.0 and later.

Declaration Syntax
void PanelWillExpand(
Id sender,
bool expanding
)
Sub PanelWillExpand ( _
sender As Id, _
expanding As Boolean _
)
void PanelWillExpand(
Id^ sender,
bool expanding
)

Parameters
- sender (Id)
- The panel that is about to expand or collapse.
- expanding (Boolean)
- YES specifies that the panel is expanding; NO specifies that it is collapsing.

Version Information
- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)
Assembly:
Monobjc.AppKit (Module: Monobjc.AppKit)