Viewstate is not maintained for the inner controls if i used Enabled/disabled property in my server control

Gurus,

I am developing a server control which is used as a custom tag in asp.net pages. Basically this server control will be acting as a container (but not actuallly) control to render other controls within this. For ex. If the logged in user has appropriate rights, this server control allows the child controls to render as visible or enabled based on the logged in user rights.

i have written a logic in this server control's Render event procedure. here is the sample code snippet

if(!isuserinrole())
{
foreach (Control ctl in this.Controls)
                {
                    ctl.EnableViewState = true;
                    DisableControl(ctl);
                  ctl.RenderControl(writer);                    
                }
}
private void DisableControl(Control control)
        {
            if (control is WebControl)
            {
                ((WebControl)control).EnableViewState = true; //((WebControl)control).Enabled = false;
                ((WebControl)control).Attributes.Add("disabled", "disabled");
            }
            else if (control is HtmlControl)
                ((HtmlControl)control).Attributes.Add("Disabled", "True");
        }

this is working fine for first time. if i do postback and come back to the page, i am loosing all data in textboxes. what is the problem? am i missing anything in viewstate maintanance? please advise me. Thanks for your help.

Ram.

if(!isuserinrole())
{
foreach (Control ctl in this.Controls)
                {
                    ctl.EnableViewState = true;
                    DisableControl(ctl);
                  ctl.RenderControl(writer);                    
                }
}
private void DisableControl(Control control)
        {
            if (control is WebControl)
            {
                ((WebControl)control).EnableViewState = true; //((WebControl)control).Enabled = false;
                ((WebControl)control).Attributes.Add("disabled", "disabled");
            }
            else if (control is HtmlControl)
                ((HtmlControl)control).Attributes.Add("Disabled", "True");
        }

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