Make an auto-layout label.

Make an auto-layout box.

Make a single press button. The user clicks them and something happens immediately.

Make a repeating button. The button returns true as long as the user holds down the mouse

Make a single-line text field where the user can edit a string.

Make a text field where the user can enter a password.

Make a multi-line text field where the user can edit a string.

Make an on/off toggle button.

Make a toolbar

Make a Selection Grid

A horizontal slider the user can drag to change a value between a min and a max.

A vertical slider the user can drag to change a value between a min and a max.

Make a horiztonal scrollbar.

Make a vertical scrollbar.

Insert a space in the current layout group.

Insert a flexible space element.

Begin a Horizontal control group.

Close a group started with BeginHorizontal

Begin a vertical control group.

Close a group started with BeginVertical

Begin a GUILayout block of GUI controls in a fixed screen area.

Close a GUILayout block started with BeginArea

Begin an automatically laid out scrollview.

End a scroll view begun with a call to BeginScrollView.

Make a popup window that layouts its contents automatically.

Option passed to a control to give it an absolute width.

Option passed to a control to specify a minimum width.

Option passed to a control to specify a maximum width.

Option passed to a control to give it an absolute height.

Option passed to a control to specify a minimum height.

Option passed to a control to specify a maximum height.

Option passed to a control to allow or disallow horizontal expansion.

Option passed to a control to allow or disallow vertical expansion.