how to access the components of a window in ext.net?

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Javascript

Ext.Net

I have 1 page that has 2 windows with loaders. AddTask first window has AddTask.aspx as loader with comboboxes and textboxes and Search second window has Search.aspx as loader with a gridpanel.
I want to access a textbox in AddTask window from Search window using javascript
I am able to catch tho AddTask Window from the search using "parent.Ext.getCmp("AddTask");" but how I can access the textbox in AddTask??


Default.aspx:

var createWindow = function () {

               parent.Ext.create("Ext.window.Window", {
                   title: "اضافة المهمة",
                   titleAlign: 'right',
                   id: 'AddTask',
                   width: 500,
                   height: 600,
                   closeAction: 'destroy',
                   loader: {
                       url: "AddTask.aspx",
                       loadMask: { showMask: true },
                       autoload: true,
                       renderer: 'frame'

                   }

               }).show();
           };

<ext:Window 
            ID="Window1" 
             runat="server" 
            Closable="false"
            Resizable="false"
            Draggable="false"
            Modal="true"
            Layout="Form" Border="false" Header="False" Maximized="True" >

    
     <Items>
                <ext:TabPanel  runat="server" ID="TabPanel1" Border="false">

                <Plugins>
                <ext:TabScrollerMenu PageSize="10"/>
                </Plugins>
                <DirectEvents>
                <TabChange />
                </DirectEvents>
                
                </ext:TabPanel>


      </Items>
       <DockedItems>

                 <ext:Toolbar ID="Toolbar1"  runat="server" Layout="Container" Width="25" Flat="true" Dock="Right">
                 <Items>
                    <ext:Button ID="Button1"  runat="server" Icon="Accept" RenderTo="Toolbar1" AutoRender="true">
                    <DirectEvents>
                    <Click />
                    </DirectEvents>
                    </ext:Button>

                    <ext:Button ID="Button2"  runat="server" Icon="Add" Handler="createWindow"/>
                    <ext:Button ID="Button3"  runat="server" Icon="Application"/>
                    <ext:Button ID="Button4"  runat="server" Icon="Bell" />
                    <ext:Button ID="Button5"  runat="server" Icon="Bomb" />
                </Items>
                </ext:Toolbar>

             </DockedItems> 
       </ext:Window>

AddTask.aspx:

var createWindow = function () {
            var num = Ext.getCmp("numtext").getValue();
            parent.Ext.create("Ext.window.Window", {
                title: "نتائج البحث",
                titleAlign: 'right',
                width: 700,
                height: 300,
                closeAction: 'destroy',
                loader: {
                    url: "Search.aspx",
                    loadMask: { showMask: true },
                    autoload: true,
                    renderer: 'frame',
                    params: {
                        'num': num,
                        'flag': 'Like'
                    }
                }

            }).show();
            
        };

<td>
    <ext:Button  runat="server" ID="search" Text="بحث تقريبي" Handler="createWindow" >
    </ext:Button>
    </td>

Search.aspx:

function test() {
            var win = parent.Ext.getCmp("AddTask");
        }

<ext:Button  runat="server" ID="button1" Handler="test()" Text="test parent direct" />