Fix disabling invoke button when invoke cannot be called

- Follow up fix for bug exposed by Lyuma's fix null pointer exception on the EventTrigger component where the invoke button was supposed to be disabled, but wasn't because the button draw was happening outside the disabled group.

EasyEventEditor.cs

@@ -810,16 +810,16 @@ void DrawInvokeField(Rect position, float headerStartOffset)
         GUIStyle textStyle = EditorStyles.miniLabel;
         textStyle.alignment = TextAnchor.MiddleLeft;
 
-        bool executeInvoke = GUI.Button(buttonPos, "", EditorStyles.miniButton);
-        GUI.Label(textPos, "Invoke"/* + " (" + string.Join(", ", eventInvokeArgs.Select(e => e.Name).ToArray()) + ")"*/, textStyle);
-
         MethodInfo invokeMethod = InvokeFindMethod("Invoke", dummyEvent, dummyEvent, PersistentListenerMode.EventDefined);
         FieldInfo serializedField = currentProperty.serializedObject.targetObject.GetType().GetField(currentProperty.name, BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
 
         object[] invokeTargets = currentProperty.serializedObject.targetObjects.Select(target => target == null || serializedField == null ? null : serializedField.GetValue(target)).Where(f => f != null).ToArray();
 
         EditorGUI.BeginDisabledGroup(invokeTargets.Length == 0 || invokeMethod == null);
 
+        bool executeInvoke = GUI.Button(buttonPos, "", EditorStyles.miniButton);
+        GUI.Label(textPos, "Invoke"/* + " (" + string.Join(", ", eventInvokeArgs.Select(e => e.Name).ToArray()) + ")"*/, textStyle);
+
         if (eventInvokeArgs.Length > 0)
         {
             System.Type argType = eventInvokeArgs[0];

package.json

@@ -1,7 +1,7 @@
 {
   "name": "com.merlin.easyeventeditor",
   "displayName": "Easy Event Editor",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "unity": "2017.4",
   "description": "Drop in replacement for the default Unity event editor drawer that allows listener reordering and a few other things",
   "keywords": ["Event", "Editor", "Delegate"],