In DotNet application there are standard and custom object and for that QTP unable to retrive certain property values due to child objects property cannot retrive direclty or perform any operation e.g. set, input, select then use .Object methods
e.g. SwfWindow("****).SwfObject("****").Object.ChildItem(i).Text
SwfWindow("****).SwfObject("****").Object.ChildItem(i).Set "xyx"
To know the Child property there is .Net Spy avaliable if you installed .Net addin in addtion to standard Object Spy.
Explore more about .net spy you will find more details about object methods.
-Shirish