Select item from Combobox - Property Visible = False, VisibleOnScreen = False

Hi,

I want to test a desktop application written in C++.

I want to click on a selected item from a combobox with property Visible = False and VIsibleOnScreen = False.

I am using call tile.ComboBox.ClickItem(1) but I receive the message The 'xxx' windowis invisible and thus cannot be activated.

Is there a possibility to select a value from the combobox if is set visible = false? Or can I set Visibility = True for the object before clicking the item?

Thanks