expose bottom panel button to EditorPlugin scripts

tools/editor/editor_plugin.cpp

@@ -44,9 +44,9 @@ void EditorPlugin::remove_custom_type(const String& p_type){
 }
 
 
-void EditorPlugin::add_control_to_bottom_panel(Control *p_control, const String &p_title) {
+ToolButton * EditorPlugin::add_control_to_bottom_panel(Control *p_control, const String &p_title) {
 
-	EditorNode::get_singleton()->add_bottom_panel_item(p_title,p_control);
+	return EditorNode::get_singleton()->add_bottom_panel_item(p_title,p_control);
 }
 
 void EditorPlugin::add_control_to_dock(DockSlot p_slot,Control *p_control) {

tools/editor/editor_plugin.h

@@ -29,6 +29,7 @@
 #ifndef EDITOR_PLUGIN_H
 #define EDITOR_PLUGIN_H
 
+#include "scene/gui/tool_button.h"
 #include "scene/main/node.h"
 #include "scene/resources/texture.h"
 #include "undo_redo.h"
@@ -92,7 +93,7 @@ public:
 	//TODO: send a resoucre for editing to the editor node?
 
 	void add_control_to_container(CustomControlContainer p_location, Control *p_control);
-	void add_control_to_bottom_panel(Control *p_control, const String &p_title);
+	ToolButton *add_control_to_bottom_panel(Control *p_control, const String &p_title);
 	void add_control_to_dock(DockSlot p_slot,Control *p_control);
 	void remove_control_from_docks(Control *p_control);
 	void remove_control_from_bottom_panel(Control *p_control);