diff --git a/app/src/main/kotlin/jackall/moncalc/viewmodel/OverlayRegistViewModel.kt b/app/src/main/kotlin/jackall/moncalc/viewmodel/OverlayRegistViewModel.kt
index 99f1b2d..24b0041 100644
--- a/app/src/main/kotlin/jackall/moncalc/viewmodel/OverlayRegistViewModel.kt
+++ b/app/src/main/kotlin/jackall/moncalc/viewmodel/OverlayRegistViewModel.kt
@@ -1,13 +1,12 @@
 package jackall.moncalc.viewmodel
 
-import android.arch.lifecycle.ViewModel
-import android.arch.lifecycle.ViewModelProvider
+import android.databinding.BaseObservable
 import android.view.View
 
 /**
  * Created by matsumoto_k on 2017/11/01.
  */
-class OverlayRegistViewModel : ViewModel() {
+class OverlayRegistViewModel : BaseObservable() {
     fun onClickMin(view: View) {
         println("onClickMin")
     }