If you put a radspreadsheet inside a radtabstrip with multipage, the controls do not render properly.

In my scenario, I have a tabstrip embedded within a tabstrip, and a grid in the nested tabstrip.  That works fine.  Once you put a spreadsheet control in the multipage, the controls do not render properly. 

However, I was able to reproduce the results with the first scenario above, which is the most simple.

The lines shifts badly after line 10 

You think you are on line 17  but the cursor is on line 16.  Very annoying bug for those using this control.  Please fix and give us an update.

Look the attached file.

Expected: https://www.screencast.com/t/bvkiEnFk7uhc (as in the Kendo Spreadsheet http://demos.telerik.com/kendo-ui/spreadsheet/index)

Actual: https://www.screencast.com/t/6Vu2f1bR3Oy0 (the tooltip is not visible) https://demos.telerik.com/aspnet-ajax/spreadsheet/examples/overview/defaultcs.aspx

Workaround: 
Add the styles for the tooltip from the Kendo Spreadsheet

html body .RadSpreadsheet .k-tooltip {               

    border-radius: 4px;
    background-image: none, linear-gradient(rgba(255, 255, 255, 0.6) 0px, rgba(255, 255, 255, 0) 100%);
    background-color: rgb(234, 232, 232);
    color: rgb(49, 49, 49);
    box-shadow: rgba(0, 0, 0, 0.3) 0px 4px 6px;
    background-position: 50% 50%;
    border-color: transparent;
    z-index: 12000;
    min-width: 20px;
    text-align: center;
    border-style: solid;
    border-width: 0px;
    padding: 5px 5px 5px 6px;
    background-repeat: repeat-x;
}