grid auto increment

Question

x:Name="dataGridView" ShowGridLines="True" >

<Grid.RowDefinitions >

<RowDefinition Height="80" MouseEnter="RowDefinition_MouseEnter" />

<RowDefinition Height="55" />

<RowDefinition Height="55" />

</Grid.RowDefinitions>

<Grid.ColumnDefinitions>

<ColumnDefinition Width="42"/>

<ColumnDefinition Width="3000"/>

</Grid.ColumnDefinitions>

 

i wrote this code for grid but if i want to auto increment row height grid after placing object what should i do...any one pls help me