If you start this code, the first tab is active. Click into the input text box, the tab is still active. Now enter any key into the textbox and wait a second. Now the first tab isnt't active any more, but the content of the tab is still shown.
If you disable the validation, the tab stays active when changing the text box.
Take the following example code
If you start this code, the first tab is active. Click into the input text box, the tab is still active. Now enter any key into the textbox and wait a second. Now the first tab isnt't active any more, but the content of the tab is still shown.
If you disable the validation, the tab stays active when changing the text box.