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I've encounderd an strange issue with sfTextBoxExt where if a form or control containing sfTextBoxExt looses focus and again gains focus, the data entered in Textboxs are gone making it null.
To help you regenerate the problem I've attached a sample project (VS 2015) and also some images (stored on google drive - link below) so that you can get to know what is the problem.
KJKeerthana Jegannathan Syncfusion Team June 8, 2017 09:22 AM UTC
Hi Amit,
We considered this issue “Value clears in SfTextBoxExt when moved to other tab” as bug and a support incident has been created under your account to track the status of this requirement. Please log on to our support website to check for further updates.