You can create an image button control for the uploader and include it with your toolbar.

 

Please check this example:

 

Simple Upload with Progress (Customizing the UI)
A sample demonstrates how to customize the look and feel of file upload controls.

 

The source code of this example can be found in the download package.

 

>>I found a method to upload one file but not multiple.

 

Please make sure you set MultipleFilesUpload property to true.

 

<CuteWebUI:Uploader runat="server" ID="Uploader1" InsertText="Upload Multiple Files (Max 10M)" MultipleFilesUpload="true">
     <VALIDATEOPTION MaxSizeKB="10240" />

</CuteWebUI:Uploader>

 

Hope it helps.