Hi, Romian.

The desired functionality of defining a custom template for the select column inside the Grid can be achieved with the current implementation of the component. 

Here is a StackBlitz example demonstrating how we can define our own template for the selection column. In this project we have the following template:

<template #mySelectCell="{ props }">
    <td colspan="1" class="k-table-td" role="gridcell" dataindex="1">
    <KCheckbox
        :id="props.id"
        :size="'large'"
        @change="onSelectionChange({ dataItem: props.dataItem })"
    />
    <label class="k-checkbox-label" :for="props.id"></label>
    </td>
</template>

and the following configuration for the selected column:

columns() {
    return [
    {
        field: 'selected',
        width: '50px',
        headerSelectionValue: this.areAllSelected,
        cell: 'mySelectCell',
    },
    ...this.staticColumns,
    ];
}

The important thing in the above definition is that we should wrap the content of the selected column using the code in green. In the current example, we are using the Kendo UI for Vue Native Checkbox component with a size property set to "large". Based on your scenario you can use the component you need. The important thing is to call the onSelectionChange event once you want to select/deselect a given row.

Because of the above example, I am marking the status of the current FR to "Completed" as the desired functionality is already available for the Native Grid.

Please check the above solution and let me know if you have questions about the suggested implementation.

Looking forward to your reply.

Regards,
Petar
Progress Telerik