multiple-use textboxes?

I have a project where the student has to solve a problem by looking at a series of graphs, each identified by a numeric ID. In the project I have a textbox where I want the user to type an ID (I considered using buttons, but in the real-world application for which students are training they search by number, so I figure I should try and mimic that).

The success action for the textbox is a conditional action that sets the state of an otherwise invisible button to a state that displays the desired graph in part of the screen. The button then becomes visible, and clicking it returns it to the default state (button invisible, no graph displayed). The "else" action for the conditional displays a generic "this is not the graph you're looking for" message.

Ok, so, I'm rather proud of myself for coming up with this, except there's one problem: It seems that even if it's set to infinite attempts, once the text box registers a "success", it doesn't do anything for subsequent entries.

I have figured out a workaround, but it's a bit of a kludge: give the next slide an On Enter action that jumps back to the previous slide, thereby "reloading" the text box so it behaves as expected. Obviously this is going to make navigation tricky, and it's just a messier solution than I'd like.

Does anyone know a better way to do this?