Detect if DateTimePicker calendar is opened

[Andrus]

I placed DateTimePicker to Winforms DataGridView using sample code from
MSDN.

When dropdown calendar is not opened, up and down arrow keys must move
to previous/next row in grid.
So I modified EditingControlW antsInputKey() to add check for this using code
below.

This causes error

'CalendarEditin gControl' does not contain a definition for 'DroppedDown' and
no extension method 'DroppedDown' accepting a first argument of type
'CalendarEditin gControl' could be found (are you missing a using directive
or an assembly reference?)

How to find if calendar opened in EditingControlW antsInputKey ?
How to allow up and down arrows to move to other row in grid when dropdown
is closed ?

Andrus.

public bool EditingControlW antsInputKey(Ke ys key, bool
dataGridViewWan tsInputKey) {

switch (key & Keys.KeyCode) {
case Keys.Left:
case Keys.Right:
case Keys.Home:
case Keys.End:
return true;

case Keys.Prior:
case Keys.Next:
case Keys.Up:
case Keys.Down:
// next line causes error since DroppedDown property not exists:
if (this.DroppedDo wn)
return true;
break;

}
//
// defer to the DataGridView and see if it wants it.
//
return !dataGridViewWa ntsInputKey;

}