Dear
tufanv
why you use some extra calculation like
-btn0.height and not using directly
40%y ?
maybe one of these tips help you :
- check your border button maybe it must be "0" and then you could use 100% width for them
- you use 100% of your width for putting 3 buttons side by side , try to make the width of two buttons 24% and test it
- try to put them as child in a parent panel that you define with 10% height and 100%x width and panel.top = 40%y
then just put 3 buttons in panel and set the top of them Zero
- try to move the top properties in designer under the left properties and test it