how to change textfield background color programatically

[sri]

hi am doing textfeild validation and when the user enters details and clicks submit 

 if user forgets sometextfields i want to show those text fields in red color 

 

i have tried 

textField.getStyle().setBackgroundGradientEndColor(Style.BACKGROUND_GRADIENT_LINEAR_HORIZONTAL, true);

textField.getStyle().setBackgroundGradientStartColor(0x202020, true);

textField.getStyle().setBackgroundGradientEndColor(0x7cfc00,true);

textField.getStyle().setBgImage(null); 

but field color dint change

 am i missing something ?

[Shai Almog]

Hi,
I suggest not using gradients. They are VERY inefficient! Usage image borders or images: http://www.codenameone.com/how-do-i---improve-application-performance-or-track-down-performance-issues.html

A text field has a border which takes precedence over gradient/bg-image so you would need to null it as well.
You should never use getStyle() and only use getUnselected/Selected/Pressed/Disabled() style.

A better approach would be:

textField.setUIID("InvalidTextField");

Then just style it in the designer.