VB -> C#: A conversion error occurred when tracking a control using the event's "sender" parameter

VB.Net input code

We want to control the appearance of a set or class of combo boxes or respond to some behavior by writing a combo box click event

Private Sub TextBox_ComName_Click(sender As Object, e As EventArgs) Handles ComboBox_AreaName.Click
    sender.DroppedDown = True    
End Sub

The reason for using the event's "sender" parameter instead of the control name is that we want to control multiple controls at the same time with just one event

Erroneous output

private void ComboBox_AreaName_Click(object sender, EventArgs e)
{
    sender.DroppedDown = (object)true; 
}

Compiler Error CS1061:'type' does not contain a definition for 'name' and no accessible extension method 'name' accepting a first argument of type 'type' could be found (are you missing a using directive or an assembly reference?).

Expected output

will be referenced by multiple combo box click events

private void ComboBox_AreaName_Click(object sender, EventArgs e)
{
    ComboBox combo = (ComboBox)sender;
    combo.DroppedDown = true; 
}

Details

Product in use: e.g. icsharpcode.github.io/CodeConverter / VS extension / both
Version in use: e.g. 5.6.3 or a commit hash (if it's a 3rd party tool using this library, try one of the above)
Did you see it working in a previous version, which?
Any other relevant information to the issue, or your interest in contributing a fix.

icsharpcode / CodeConverter