Cocosw.BottomSheetActions.BottomSheet.Builder b = new Cocosw.BottomSheetActions.BottomSheet.Builder (this);
b.Title ("New");
b.Sheet (Resource.Layout.menu_bottom_sheet)

button.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        // Perform action on click
    }
});

class BottomSheetActions : IDialogInterfaceOnClickListener {
    public void OnClick (IDialogInterface dialog, int which) {
        Console.WriteLine ("Hello fox");
    }

    public IntPtr Handle { get; }

    public void Dispose() {

    }
}

b.Listener (new BottomSheetActions());

internal class BottomSheetActions : Java.Lang.Object, IDialogInterfaceOnClickListener
{
    public void OnClick (IDialogInterface dialog, int which)
    {
        Console.WriteLine ("Hello fox");
    }
}

button.Click += delegate
{
    //Your code
};

you can use the custom layout for bottomsheetdialog by using below code:

**CustomLayout:**
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
               xmlns:local="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:background="#FAFAFA"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:textSize="16sp"
        android:layout_weight="1"
        android:gravity="center"
        android:background="#ffffff"
        android:textColor="#B0BEC5"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Are You Going to Use map?"
        android:textAlignment="gravity"
        android:padding="20dp" />
    <LinearLayout
        android:padding="20dp"
        android:layout_weight="3"
        android:scrollbars="horizontal"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="2dp">
      <Button
            android:elevation="5dp"
            android:textSize="16sp"
            android:layout_weight="1"
            android:gravity="center"
            android:background="@drawable/btnselector"
            android:textColor="#90CAF9"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="No"
            android:textAlignment="gravity"
            android:layout_margin="10dp" />
      <Button

        android:id="@+id/btnyes"
         local:MvxBind="Click Confyes"
            android:textSize="16sp"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:elevation="5dp"

            android:layout_weight="1"
            android:gravity="center"
            android:background="@drawable/btnselector"
            android:textColor="#90CAF9"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="Yes"
            android:layout_margin="10dp" />
    </LinearLayout>
</LinearLayout>

**MainActivity**


  BottomSheetDialog BSheetdialog = new BottomSheetDialog(this);
  BSheetdialog.SetContentView(Resource.Layout.termconditionpopup);
            var yes = dialog.FindViewById(Resource.Id.btnyes);
            yes.RequestFocus();
            yes.Click += delegate {
//Your Code Here
}