Enabling virtual keyboard to enter the text/number as soon as Text box clicked.

Hello,

I have a requirement to enable the Virtual keyboard pop up as soon as text box clicked to enter the text, I tried to enable using the menuconfig but not able to do it.

System configuration as below:

I am using the RZG1M board, Yocto 2.0 build environment, In my application so many text boxes are there and application is developed using GTk.

How we can enable the virtual keyboard, in order to enter the text?

Regards,

Charan