Patrick, is the following...
When I Select a item in a dropdown (of "Computer Name" I click in the button and the change visualization. In the other visualization the before item selected (in the DropDown of "Computer Name")fill a TextBox.
I have filters in TextBoxes and ListBoxes...
The filters in TextBoxes I make in "Define Value"(My infoPath Is in Portuguese, sorry,but,I don't know this field in English...ok?) and there I make all filters based in the TextBox with the "Computer Name" Value.
In my ListBoxes I make the filter in "Data Connection", in "Input" and after I go to "Data Filters", and so I meke the filter based in the same field "Computer Name", but the filter Don't work because the letters of the "Computer Name" are lower case. When the letters are in Upper Case, work very well. Sorry by the bad english...rs.If you don't undestand what I tryed talk to you, just say me a way that make the letters in a text box become UpperCase. Thanks for atention..