unable to get the webbuttons count(child objects)

[qtpexpert]

Hi guys,

In my application in side the frame few buttons are available like add, delete, filter...

I could recognize the frame by using index number. now i want to count the no.of buttons in the frame(it is grid)

Here I can able to click the single button individually with name property.
I f i follow this i have to write function for each button individually. I do not want this.

If i have buttons count based on that count i will click on particular button.

I tried with the following code but i'm getting the type mismatch error.

Code:

Set WebBrowserDesc=Description.Create
                            WebBrowserDesc("application version").value="internet explorer 8"
                            WebBrowserDesc("title").value="http://172.16.220.24/Proof/PageManager.aspx"
                            
                            Set WebPageDesc=Description.Create
                            WebPageDesc("url").value="http://172.16.220.24/Proof/PageManager.aspx"

Set WebFrameDesc=Description.Create
                            WebFrameDesc("html tag").value="IFRAME"
                            'WebFrameDesc("title").value="PROOF - ISpace"
                            WebFrameDesc("Index").value="5"

Set WeButtonDesc=Description.Create
                             WeButtonDesc("type").value="submit"
                             WeButtonDesc("html tag").value="INPUT"
                             'WeButtonDesc("name").value="Add"
                               WeButtonDesc("micclass").value="WebButton"

                                Set objwebbutton=Browser(WebBrowserDesc).Page(WebPageDesc).Frame(WebFrameDesc).ChildObjects(WebButtonDesc)                    
                                msgbox objwebbutton.Count

please find the attachement for error.

any one knows the solution.
pls providethe solution ASAP.

Thanks in Advance!