Fix custom combobox

Job ID: 34785022

Budget: $10 – $30 USD

I currently have a custom combobox that shows a richtextbox instead of the usual dropdown menu.

Requirement 1:
However, sometimes, when the dropdown button is clicked, sometimes the regular dropdown menu shows, instead of the richtextbox. I would like this fixed.

Requirement 2:
Furthermore, I would also like the richtextbox to be shown on top of a Control.

Other details:
Must be written in VB.NET, Framework 4.8.1, without any warnings or errors
Related categories: Visual Basic VB.NET