EditorGUI.BeginDisabledGroup
static function BeginDisabledGroup(disabled: bool): void;
static void BeginDisabledGroup(bool disabled);
static def BeginDisabledGroup(disabled as bool) as void
Parameters

disabled Boolean specifying if the controls inside the group should be disabled.
Description

Create a group of controls that can be disabled.

If disabled is true, the controls inside the group will be disabled. If false, the enabled/disabled state will not be changed.
	canJump = EditorGUILayout.Toggle ("Can Jump", canJump);
	
	// Disable the jumping height control if canJump is false:
	EditorGUI.BeginDisabledGroup (canJump == false);
	jumpHeight = EditorGUILayout.FloatField ("Jump Height", jumpHeight);
	EditorGUI.EndDisabledGroup ();
The group cannot be used to enable controls that would otherwise be disabled to begin with. The groups can be nested and the controls within a child group will be disabled both if that child group is itself disabled or if a parent group is.