按下pager控件的前页后页按钮的时候，如何保持之前选择的行还是选择的状态

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框架 asp.net core mvc
按下pager控件的前页后页按钮的时候，flexgrid里的选择行变成下一页或上一页的第一行，
按下前页后页按钮的时候，能不能保持原来选择行的状态，下一页或上一页的第一行不自动变为选择行？

<c1-flex-grid auto-generate-columns="false"
is-read-only="true"
selection-mode="ListBox"
allow-sorting="true"
id="Grid">
<c1-items-source source-collection="@list" page-size="10" />
<c1-flex-grid-column binding="Id" />
<c1-flex-grid-column binding="Group" />
<c1-flex-grid-column binding="Name" />
<c1-flex-grid-column binding="No1" />
<c1-flex-grid-column binding="No2" align="right" />
<c1-flex-grid-column binding="Flag" />
<c1-flex-grid-column binding="Item">
<c1-data-map display-member-path="Name" selected-value-path="Code">
<c1-items-source source-collection="@MasterService.QueryMasterList()"></c1-items-source>
</c1-data-map>
</c1-flex-grid-column>
<c1-flex-grid-column binding="DateTime1" format="yyyy-MM-dd" />
<c1-flex-grid-column binding="DateTime2" format="yyyy-MM-dd HH:mm:ss" />
</c1-flex-grid>
<c1-pager owner="Grid" class="float-md-right" />