为什么我的文本框在tabcontrol中处于只读模式？

Question

I'm working with .net framework 4.0 ، Visual Studio 2010 and writing in c#. in my windows form application i have a tabcontrol called tablcontrol1 and within that i have a textbox called txt_name.
in txt_name property i didn't set the ReadOnly attribute to true. but when i start the application the txt_name which is within the tabcontrol1 is some kind of ReadOnly :
i mean it's value can't be changed and it's background-color is grey just like a ReadOnly textbox and when i put the txt_name outside of the tabcontrol1 : it is fixed and it's not in ReadOnly mood so i guess the main problem is with the tabcontrol1.
I searcher a lot but i don't what should i do with that!

Answer 1

Try to check [Enabled] property
also controls.Enable like the below

 foreach (Control ctl in tablcontrol1.Controls) ctl.Enabled = true;