Want to set the Checkbox in Gmail Inbox

[shesharm]

Hi,
I am trying to set or click the CheckBox in Gmail Inbox.There are total 8 columns.I am able to see 3 to 8 columns getting HighLight properly. But when i try to highLight column 1 and 2 ,it shows nothing and gives the error "Object required: 'ObjChildItem'
Line (27): "ObjChildItem.HighLight"

Code: For i = 1 to ObjGetRow
Set ObjChildItem = ObjInboxPage.ChildItem(i,1,"WebElement",0)
ObjChildItem.HighLight

All the objects are showing as WebElement ,even the checkBox also. Please help me to resolve the issue.

Thanks in Advance,