Ho can I add components such as combo boxes, text boxes inside to a text box?
If you want users to be able to edit text using different kinds of controls, you can specify the GoText.EditorStyle property, for example by setting it to GoTextEditorStyle.ComboBox along with setting GoText.Choices.
If you want those controls to be visible all the time, not just when the user is editing a GoText, then you’ll need to use GoControl objects to host Windows Forms Controls in each GoView.