Simple bar chart but with extension

[nirmalkumar]

Hello All,

i am completely new to Qlik, i am trzing to make an extension for simple bar chart but i am struggling with paint function i guess. can someone help me with this? i need just a small extension which can make bar chart as below.

[simonaubert]

Stupid question but why do you want to make this extension? 

[nirmalkumar]

@simonaubert  Its just a baby step before i make something amazing.