[WINFORM] Scroll partially visible when window loads

Question

Hello everyone

My window structure hierarchy is as follows

Spiltcontainer1.panel1  -->
Docked
Spliectopntainer2.panel1 --->
docked
tablcontainer --->
docked
treeview or richtectbox

TreeView and richtextbox control is not fully visible when window loads check the attachment

any idea?