Twigy:
they are bounded by a combo box, as they are related to each other.
In as much as that makes any sense, it's impossible.
I can only guess what you mean but if I'm right then you want to filter the report based on the value found in the control on your form (although you now seem to be implying the control is a ComboBox and no longer a TextBox). The call to open the report also has a
WhereCondition parameter that allows you to specify a filter in the form of a SQL WHERE clause.
Frankly, it's hard to help when you post responses that make so little sense. A bit more care and consideration before submitting the post would help us both enormously.