Sorry but it does not work. I’ve tried everything ...

# android

[o.semen]

Sorry but it does not work. I’ve tried everything I could. So what do I have:
main_activity.xml

<DrawerLayout android:id="@+id/mainDrawer" ...>
  <RelativeLayout ...>
    <include android:id="@+id/toolbarLayout" layout="@layout/custom_toolbar_layout" />
    ...
  </RelativeLayout>
</DrawerLayout>

custom_toolbar_layout.xml

<Toolbar android:id="@+id/toolbarWidget">
 ...
</Toolbar>

MainActivity.kt

import kotlinx.android.synthetic.main.main_activity.*
import kotlinx.android.synthetic.main.custom_toolbar_layout.view.*

fun onCreate() {
        setContentView(R.layout.main_activity)
        setSupportActionBar(toolbarWidget) //does not work - `null`
        setSupportActionBar(mainDrawer.toolbarWidget) //does not work - `null`
}