<accordion:AccordionItem IsExpanded="true">
                            <accordion:AccordionItem.Header>
                                <Label TextColor="White" Text="Laboratory" HeightRequest="50" VerticalTextAlignment="Center" BackgroundColor="#990000"/>
                            </accordion:AccordionItem.Header>
                            <accordion:AccordionItem.Content>
                                <combobox:SfComboBox HeightRequest="40" x:Name="cbLaboratory" DataSource="{Binding LaboratoryCollection}" DisplayMemberPath="labName" MultiSelectMode="Token" IsSelectedItemsVisibleInDropDown="False" 
                                                     AllowFiltering="True" SuggestionMode="StartsWith" IsEditableMode="True" ValueChanged="CbLaboratory_ValueChanged">
                                    <combobox:SfComboBox.TokenSettings>
                                        <combobox:TokenSettings FontSize="16" BackgroundColor="#66ccff" 
                                        TextColor="White" SelectedBackgroundColor="#990000" 
                                        DeleteButtonColor="Color.Brown" IsCloseButtonVisible="true" 
                                        CornerRadius="15" DeleteButtonPlacement="Right">
                                        </combobox:TokenSettings>
                                    </combobox:SfComboBox.TokenSettings>
                                </combobox:SfComboBox>
                            </accordion:AccordionItem.Content>
                        </accordion:AccordionItem>